feat: Basic Application Settings (#58)

* .

* .

* .

* update modal

crates/settings/Cargo.toml

@@ -0,0 +1,16 @@
+[package]
+name = "settings"
+version.workspace = true
+edition.workspace = true
+publish.workspace = true
+
+[dependencies]
+global = { path = "../global" }
+
+nostr-sdk.workspace = true
+gpui.workspace = true
+anyhow.workspace = true
+log.workspace = true
+smallvec.workspace = true
+serde.workspace = true
+serde_json.workspace = true